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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1e2a26e740975ccf8323a3694ac32563017953806600a22741ead86a93706cc' 
  AND token = 'ybOn7VuHWaloIhO2DGuaSOMKO8PkkJhpOYpi6MTEyUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}